That would be necromass.
Another term for decayed organic matter is "humus".
Decayed organic matter
decayed organic matter
Living things that have been decayed
Decayed matter that becomes part of the soil is called organic matter. This includes leaves, plant material, animal remains, and other organic substances that break down and contribute nutrients to the soil. Organic matter is important for soil fertility and structure.
It is soil. _________________ Maybe you're speaking of Humus.
organic matter important to plant growth is humus.
weathered rock,decayed organic matter,water and sediments.
IIt is called organic matter.
Decayed substances are commonly referred to as decomposed organic matter or simply as decaying matter. Decay occurs when organic material breaks down into simpler compounds through the action of microorganisms like bacteria and fungi.
Partially decayed organic matter is commonly known as peat. It forms in waterlogged environments where decomposition is slow due to lack of oxygen. Peat is an important component in the formation of coal and can be used as a fuel source.
soil